Start with the mission and component
Space hardware must be assessed for its intended environment and function. A general mechanical wear benefit does not establish mission qualification.
Assess radiation as a separate requirement
NASA radiation tools account for radiation environment, material composition and shielding geometry or thickness. These variables cannot be replaced by a generic claim that a thin wear coating is an impermeable radiation barrier.
Require application-specific tests
Thermal cycling, vacuum, radiation and impact requirements need their own evidence. Wear resistance alone does not demonstrate protection against those conditions or a longer mission life.
Keep the article within its evidence
This is a qualification-question overview, not a claim of a revolutionary coating, a named mission success or DVS space capability. Obtain the applicable specification and qualified process evidence before selecting a treatment.